Td Bank. America's Most Convenient Bank. Reporter: Tall, grande, venti, treinte. Skim, soy, creamed, steamed. Whether it's chai, frappucino, american, or macchiato -- across the country it's as if everyone is speaking a different language. And no one is more fluent than this man. Triple shot, decaf, chai caramel latte, and I'd like it half soy milk and half of half and half. Also, I'd like three pumps, do you have sugar free acai syrup? But if it has sugar, only three pumps, if it doesn't have sugar you can do six pumps. Okay, yes. Reporter: Today we've brought the most obnoxious and pretentious coffee orders you've ever heard to the fine grind coffee shop, in little falls, New Jersey. What would you do if you were stuck in line behind a man who's particular tastes are a definite waste of everyone's time? A little puff of cinnamon. And three red m&ms. Reporter: Lauryn tries to whip up peter's elaborate drink order, but he just can't sit still. Ah, got to get to the city, got to get to the city. Okay, let me taste it. Okay, sure. Reporter: She hands him the coffee, but something's just not right. I'm sorry. That's whole half and half. I wanted half of half and half. And you scorched it, the milk is scorched. Oh, I'm sorry. No, I didn't mean to. This is your job, you should really know what you're doing. Did you go to college for this? Actually it's really mean. I'm gonna go to the bathroom, when I come back I want this right. Start over again, I want it right. Reporter: With peter out of the picture for a moment, this woman tries to reassure laura. I want to tell you, it's all about his anxiety. It's all about his anxiety. It's not excusable, but it's his issue and it's not your issue. Thank you so much. I'm so sorry. I'm leaving you a big tip. Reporter: A big, fat tip. And with everything our barista has to deal with today, she deserves it. Can you hurry, please? I'm sorry, I've got to get to work. I come here every day, you should know my order. This isn't right. It's not 137 degrees, I can tell you that much. Go, make it again, and get it right this time! You haven't done it yet? Almost. Reporter: These women are beyond words, until peter is out the door. That was absolutely disgusting. Disgusting! Nobody should be treated like that. And I give you credit, for not treating him the way he treated you. I stood here biting my tongue. Okay, it's a cup of coffee, and not for nothing, it's a cup of coffee. Reporter: Not for nothing. It's "What would you do?" How are you? Oh, my god! Reporter: It wasn't just a simple cup of coffee. That was not just a simple cup of coffee, there was a boogoo berry, triple shot, sugar free half and half, half soy at a particular temperature, and he was late, he had to be in the city! I was ready to sock him in the teeth. That was despicable. Reporter: This next woman, a teacher, tries to reason with him. There's two ways to do things, do you want it right? Or do you want it fast? Reporter: But, of course, he's not listening. In my world, I usually get things right and fast. No, this is terrible. And you scorched the milk. No, no, no, no, you gotta do it over again. Quick, quick, quick. Come on, it's not rocket science. It's coffee. Did you go to college? There's no reason to insult her. Give her a chance, she's new. There's no reason to get insulting, there's no reason. She's working, just let her do her job. Reporter: But peter just won't stop. She should be fired! Reporter: For Gloria Ross, that's the last straw. This is her first week, lay off. Did you never have a first job? Did you never have to learn the ropes? Unless you're perfect, you should really calm down. She's obviously not smart enough to do this job. It's a simple order. You're obviously not polite enough, or have enough common sense to not embarrass her. She's doing her job. Reporter: Time to spill the beans. Why did she speak up? Because there was no reason for that. The arrogance, she's trying to do her job. Reporter: Weren't you afraid? No, my father's a cop, my husband's a crazy man, so. Reporter: Your advice to him? If he was really this way? Nothing is that serious, nothing! There was no fire behind us, the building wasn't going to collapse on our heads, nothing is that serious. Reporter: No better way to put it all in perspective. But wait, there's more. Nothing prepared us for these next four guys. Fill it up with whipped cream, put three red m&m's on top. And the, peanuts, okay? I'm going to the bathroom, and I'll be right back. Okay? And look, really, have it done by the time I get back. I'm very sorry. No, that's okay. Honey, if you don't spit in it, I will. Reporter: They can't believe what they've just heard, and when he returns from the restroom -- forget about it. I asked you to have it ready by the time I come out of the bathroom! Excuse me, sir. Man, relax. Look, I'm paying for this! We're paying for it too, but you have to be nice to her as well. Yeah, you're being disrespectful. This is her job. She should be fired! Reporter: But again, peter is just getting fired up. You know what? Do it again, just put the whip cream on top. Reporter: With that, we're headed for a grande blow-up here. Take a walk! You're not getting served. Get the manager, where's the manager? It wasn't a complicated order. That was a pretty complicated order. And I talked her through the whole thing. Go, go, go. Reporter: Time to vent a little steam here. I'm the manager. What's going on? I'm John Quinones. You're on a show. Reporter: How would you describe this guy? A straight . Excuse my language. I felt terrible for her. I was gonna tip her, like, $10. Reporter: Four strangers, who just wouldn't let a fancy latte, ruin our friendly employee's

This transcript has been automatically generated and may not be 100% accurate.

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